"Democrats aren't just running on good old ideas like a higher minimum wage, they’re running on good new ideas like Medicare-for-all," Obama noted. If Medicare-for-all is such a great idea -- which I suppose means Obamacare is failure -- why did Democrats spend every drop of political capital unilaterally shoving a wide-ranging national restructuring of a vital part of the economy through the system? Anyone who argued at the time that Obamacare was merely a step towards a broader socializing of medicine were immediately called liars by professional factcheckers, racists by Democrats, and accessories to murderer by activists.
You remember the comity of the Obama years, right?

The former president's haughty finger-wagging reminds us that the Trump presidency is, in big part, a manifestation of a fracture that was the result of the systematic destruction of process and subversion of political standards by his administration and its allies. Obamacare was just one example. Which is why I'm skeptical that the former will help Democrats (whom polls show doing well without him) more than unite conservatives heading into the midterms.